The Fitball Workoutby Jan Endacott (9780600614364)

These pilates and yoga inspired exercises greatly improve core stability, stretch and tone muscles and increase strength and flexibility for a leaner, more streamlined body. Fitball is suitable for men and women of all fitness levels, and is especially useful for sufferers of back pain. There are variations on exercises and a menu of different routines so that readers can tailor the workouts to their individual needs.